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What causes backfire through air flow system

(1990 Pontiac Bonneville)
in Sparta, TN on March 20, 2012
changed mass air flow and crank sensor won't stay running any more tried catalytic converter didnt work
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of Greg's Orange Auto on March 20, 2012
TAKE IT IN AND HAVE IT DIAG BY A MECH YOU ARE WASTING $
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on March 23, 2012
alright i figured as much my wife has been sayin the same thing but its no fun listening to her that would be to easy lol
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